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Cho, Jaephil
Nano Energy Storage Materials Lab (NESM)
Research Interests
  • Li-ion battery, metal-air battery, redox-flow battery, flexible battery .

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Hierarchical surface atomic structure of a manganese-based spinel cathode for lithium-ion batteries

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Title
Hierarchical surface atomic structure of a manganese-based spinel cathode for lithium-ion batteries
Author
Lee, SanghanYoon, GabinJeong, MinseulLee, Min-JoonKang, KisukCho, Jaephil
Issue Date
2015-01
Publisher
WILEY-V C H VERLAG GMBH
Citation
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.54, no.4, pp.1153 - 1158
Abstract
The increasing use of lithium-ion batteries (LIBs) in high-power applications requires improvement of their high-temperature electrochemical performance, including their cyclability and rate capability. Spinel lithium manganese oxide (LiMn2O4) is a promising cathode material because of its high stability and abundance. However, it exhibits poor cycling performance at high temperatures owing to Mn dissolution. Herein we show that when stoichiometric lithium manganese oxide is coated with highly doped spinels, the resulting epitaxial coating has a hierarchical atomic structure consisting of cubic-spinel, tetragonal-spinel, and layered structures, and no interfacial phase is formed. In a practical application of the coating to doped spinel, the material retained 90% of its capacity after 800 cycles at 60°C. Thus, the formation of an epitaxial coating with a hierarchical atomic structure could enhance the electrochemical performance of LIB cathode materials while preventing large losses in capacity.
URI
https://scholarworks.unist.ac.kr/handle/201301/10263
URL
http://onlinelibrary.wiley.com/doi/10.1002/anie.201408853/abstract
DOI
10.1002/anie.201408853
ISSN
1433-7851
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